overhauling vs refit

overhauling

noun
  • The act by which something is overhauled. 

refit

noun
  • The process of having something fitted again, repaired or restored. 

verb
  • To prepare for use again; to repair or restore. 

  • To fit again; to put back into its place. 

  • To fit out or supply again (with something). 

  • To prepare a vessel for use again (e.g. by replenishing depleted supplies or doing maintenance or repair work); (of a vessel) to be prepared for use again. 

How often have the words overhauling and refit occurred in a corpus of books? (source: Google Ngram Viewer )